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Stabilized thermoplastic polymer composition

a thermoplastic polymer and composition technology, applied in the direction of transportation and packaging, organic chemistry, aluminium compounds, etc., can solve the problems of phosphorus compound disappearance undetectedly rapid from the polymer, the long term stability of the phosphorus compound stabilized polyolefin polymer composition with respect to, e.g., melt index, and may be compromised

Inactive Publication Date: 2002-03-26
CROMPTON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rapid disappearance of the phosphorus containing additive has given rise to a concern that the long term stability of phosphorus-containing additive stabilized polyolefin polymers compositions with respect to, e.g., melt index, may be compromised.
While not wishing to be bound by theory, it is believed that silica present in prior art polymers is involved in the undesirably rapid disappearance of the phosphorus compound from the polymer, particularly when the polymers are exposed to conditions of elevated temperature, high relative humidity or elevated temperature and high relative humidity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

1-14

The following materials were used to make the thermoplastic polymer compositions of Examples 1-14:

"HDPE": FA 53-035 high density polyethylene, melt index (high load) of about 6 g / 10 min (Paxon Polymer Company);

"Phosphite": Bis(2,4di-t-butyl)pentaerythritol diphosphite ULTRANOXTM.TM. 626 antioxidant (GE Specialty Chemicals, Inc.);

"Antioxidant": Polyphenol antioxidant, tetrakis(methylene (3,5-di-t-butyl-4-hydroxyhydrocinnamate, IRGANOX.TM. 1010 antioxidant (Ciba-Geigy);

"Amine": reaction product of 2,4-dichloro-6-(4-morpholinyl)-1,3,5-triazine with a polymer of 1,6-diamine, N, N'-Bis(-2,2,4,6-tetramethyl-4-piperidenyl) hexane, CYASORB.TM.3346 LD light stabilizer, (Cytec);

"Neutralizer" zinc stearate;

"PEG 3350": CARBOWAX.TM. 3350 polyethylene glycol, M.sub.n =3350 (Union Carbide Company);

"PEG 8000": PLURACOL.TM. E800 polyethylene glycol, M.sub.n =8000 (BASF);

"PEG 20000": POLYGLYKOL.TM. 20000S polyethylene glycol, M.sub.n =20,000 (Hoechst);

"PEG Distearate": Polyethylene glycol 400 Dis...

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Abstract

A thermoplastic polymer composition includes a polyolefin polymer, silica; a phosphorus-containing antioxidant compound; and a co-additive that includes one or more of (i) a polyalkylene glycol having a number average molecular weight of greater than or equal to 3,000, (ii) a polyalkylene oxide, (iii) a sterically hindered amine compound.

Description

The present invention relates to a stabilized thermoplastic polymer composition.DESCRIPTION OF THE RELATED ARTIt is well known to formulate polyolefin polymers with phosphorus-containing antioxidant-stabilizer additives, e.g., phosphites, phosphonites, to improve and preserve the properties of the polymer. It has been observed that silica-containing polyolefin polymers that are stabilized with phosphorus-containing additives exhibit a relatively rapid decrease in the amount of phosphorus-containing additive under conditions of elevated temperature and high relative humidity. The rapid disappearance of the phosphorus containing additive has given rise to a concern that the long term stability of phosphorus-containing additive stabilized polyolefin polymers compositions with respect to, e.g., melt index, may be compromised. What is needed is a technique by which the rate of disappearance of the phosphorus compound from the polyolefin polymer composition is slowed, without detrimentall...

Claims

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Application Information

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IPC IPC(8): C08K5/00C08K5/06C08K5/524C08K3/36C08K5/17C08L23/00
CPCC08K5/06C08K5/524C08L23/02C08L23/06C08K5/49C08K3/36
Inventor AVAKIAN, ROGER W.ASHTON, HENRY C.
Owner CROMPTON CORP